Fig. 7.

Impact of different levels of blood donation policies and implementation – variations of blood donation relevant parameters. We report the simulations based on convalescent plasma with $K=50,B\left(0\right)=10$. Parameters suggested in the WHO guideline are marked in the figures. Great reductions of the CFR depend significantly on the following aspects: enhancing the policy and service on donation, encouraging and recruiting donors, keeping good track of donor contacts, frequently updating stockpile information and rapid delivery, shortening the donor recovery period, and reducing the transition duration from discharge to first donation. (a) α – donation rate. (b) ξ – loss rate of donors. (c) τ – donor recovery period. (d) ${\sigma }^{-1}$ – duration from discharge to donation. (e) ${\eta }^{-1}$ – delay of switching treatment. (f) ϵ – percentage of qualified survivors.